Just printed out the form from their website and went to Men's Warehouse and they measured me. A couple of them had done it before, the others just kinda watched half amused, half intimidated by all the weird measurements.
Funny in a racial stereotype kinda way: One of the salesguys (who smelled like too much men's bodyspray) started doing all the measuring and promptly got confused (there's like, 50 measurements). So they, honest to god, went in the back and got the house Chinese lady for the pro-tailor stuff. She was cool. They were all actually pretty nice about it. They didn't even charge me.
By the way, the people at Vanson were really cool, too.